i have made a spell that would deal AOE damage to a highly armoured and 999999999hp dummy. the objective is to damage the units around the dummy unit. what i would want is that it would damage ONLY the units in a range of altitude. +-50 in this case. however, i do not know how to do this as it requires to block the damage if it is not in the range of altitudes, and that requires a specific unit event, and i NEED a generic unit event, so any ideas?